Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a133c02e93706c…

MALICIOUS

PDF

76.4 KB Created: 2021-08-19 08:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aff69e37bd0f16496ee006d2d8f9944d SHA-1: 962fb38cddf05f31b510734931e4ca8ce91c801c SHA-256: d3a133c02e93706cb4146c2e01f59bd032cdb704cef00aabf2af7f1c0890f1b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094844daaa3f---dejidaxawumozozumijed.pdf In PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/788040416.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/81322290710.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lupatotagixaruxalumajot.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160862777821c7---83455788317.pdfIn PDF document text
    • http://shosholoza.de/file/43666741297.pdfIn PDF document text
    • https://ebooksweb.net/files/file/pomeva.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/80605383621.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210629_D0EEFA680307C788.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/1110784121.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070614355c2c---28354666314.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/gugilevaxojin.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d581c06817---kefutewixegimiwadadijo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/08d3b6e6b5cc17797f2413b0e7d9b9ad/97695618402.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/74375552865.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/46273552836.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/vamufixipajikedokititave.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/putufopuguzododil.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/nanezoterabifakolip.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/38169477075.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/16142274912.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/jiwesurelu.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/kobagirazejokelupum.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076d602d5473---52732427535.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d92ef640ba0---11763075117.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/zogiduduzovawilizavolarom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mission+impossible+4+theme+mp3+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC557 16948 bytes
SHA-256: b196d377e9c3ece877fcf7fd7043a76e9d1048b4de76c7f2804fed86adb8abe3
font_01_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 11024 bytes
SHA-256: ae80539f84235dda22ffad658d78b108a08000952fec30b5f84dd8202aeb75b1
font_02_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1